n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 27 |
4 | 75 |
5 | 486 |
6 | 2208 |
7 | 10708 |
8 | 53384 |
9 | 255936 |
10 | 1264666 |
11 | 6155158 |
12 | 30091959 |
13 | 147181798 |
14 | 718659407 |
15 | 3513986897 |
16 | 17168832194 |
17 | 83908881411 |
18 | 410071803548 |
19 | 2003955083279 |
20 | 9793599928641 |
21 | 47860794887575 |
22 | 233897163096237 |
[1,4,27,75,486,2208,10708,53384,255936,1264666, 6155158,30091959,147181798,718659407,3513986897, 17168832194,83908881411,410071803548, 2003955083279,9793599928641,47860794887575, 233897163096237] |